Since these aren't 1 design race boats, nobody will have a mast rake measurement. What I do is get it looking ok at the dock, then go out sailing on a 10-12 knot day. I'll sail close hauled, and check for about 3-6º of weather helm. 3º is better, with that little bit of the rudder aiding lift to windward. If I've got too much weather helm, then I loosen forestay and take up on uppers. (On my boat, fractional rigged, with swept spreaders.) I once had the boat so balanced, the next weekend in higher winds I learned I had lee helm. Nope! You can make sure your mast is level side to side by bringing the main halyard down to each chainplate. Also, you should have about .5-.75" of mast pre-bend, which you can kinda sight by holding the main halyard along the mast. Lowers are used to keep the mast in column, and if over tight can pull pre-bend out of the mast. Taking out cotter pins is a PITA, especially when you're out on the water tuning and don't want to lose them overboard, so this year I've got some velcro pins like the racers use. Overkill, yes, but I've got too much racer in me to stop now.